Comedian Crazy Mohan (born 16 October 1952 as Mohan Rangachari) is a script writer and a playwright. An engineer by profession, Mohan started writing stage plays and established his own drama troupe called "Crazy Creations" in 1979. In addition to dramas and tele-serials, he has worked as a dialogue writer on a number of comedy films.

He has written over 30 plays, worked on over 40 films (and played cameo roles in each of these films), and written 100 short stories. He became a Mechanical Engineer in 1973. He has acted or written dialogue for over 70 films. His brother Maadhu Balaji plays hero in all his dramas.

In 1989, he also began producing television comedy series. Serials he produced include Here is Crazy, Kalyanathukku Kalyanam with over 600 episodes and Vidathu Sirippu, with the latter winning the Best Comedy Serial award from Mylapore Academy in 2005.